1·Light intensity influenced significantly involucrum, which distributed in the canopy with the relative light intensity hither than 13 % of 8-year-old boos trees 10% of 15-year-old trees.
叶幕内的光能分布对总艺的分布也有重大影响，8年生植株总苞主要分布于相对光强13%以上的叶幕层，而15年生植株总艺主要集中于相对光强10%以上的叶幕层。